JPWO2019097643A1 - User terminal and wireless communication method - Google Patents

Abstract

The user terminal according to one aspect of the present disclosure has a receiving unit that monitors a control resource set (CORESET: COntrol REsource SET) related to an active bandwidth part (BWP: BandWidth Part), and the active BWP. It is characterized by having a control unit for determining COSETET to be monitored during the period between switching from the BWP to the second BWP. According to one aspect of the present disclosure, it is possible to suppress a decrease in communication throughput even when controlling based on BWP.

Description

The present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system.

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of further high-speed data rate and low delay (Non-Patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel.10, 11, 12, 13) has been specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel.8, 9).

Successor system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE (Also referred to as Rel.14 or 15 or later) is also being considered.

In an existing LTE system (eg, LTE Rel. 8-13), a radio base station (eg, eNB (eNode B)) controls the allocation (scheduling) of data to a user terminal (UE: User Equipment). The data scheduling instruction is notified to the UE by using the downlink control information (DCI).

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

In future wireless communication systems (for example, NR), it is considered to notify the UE of DCI by using a control resource set (CORESET: COntrol REsource SET) which is a candidate area for allocation of a control channel.

Further, in NR, it is considered to set one or a plurality of bandwidth parts (BWP: BandWidth Part) included in the component carrier (CC: Component Carrier) for the UE.

As described above, it is considered that the NR is controlled based on CORESET, BWP and the like. However, studies have not yet been made on how to specifically set these in the UE and how the UE operates. If an appropriate setting method and UE operation are not used, the amount of communication may increase unnecessarily, resulting in deterioration of communication throughput, frequency utilization efficiency, and the like.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of suppressing a decrease in communication throughput even when controlling based on BWP.

The user terminal according to one aspect of the present disclosure has a receiving unit that monitors a control resource set (CORESET: COntrol REsource SET) related to an active bandwidth part (BWP: BandWidth Part), and the active BWP. It is characterized by having a control unit for determining COSETET to be monitored during the period between switching from the BWP to the second BWP.

According to one aspect of the present disclosure, it is possible to suppress a decrease in communication throughput even when controlling based on BWP.

1A and 1B are diagrams showing an example of the relationship between the BWP setting and the CORESET setting according to the first embodiment. FIG. 2 is a diagram showing an example of a monitor target at the time of BWP switching according to the second embodiment. FIG. 3 is a diagram showing another example of the monitor target at the time of BWP switching according to the second embodiment. FIG. 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 5 is a diagram showing an example of the overall configuration of the radio base station according to the embodiment. FIG. 6 is a diagram showing an example of the functional configuration of the radio base station according to the embodiment. FIG. 7 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment. FIG. 8 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. FIG. 9 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the embodiment.

In NR, it is considered to set one or a plurality of bandwidth parts (BWP: BandWidth Part) for each component carrier (CC: Component Carrier) for the UE. BWP may be referred to as a partial frequency band, a partial band, or the like.

The BWP used for DL communication may be called DL BWP, and the BWP used for UL communication may be called UL BWP. The UE may assume that one BWP (one DL BWP and one UL BWP) of the configured BWPs is active (available) at a given time. Further, the DL BWP and the UL BWP may have overlapping frequency bands.

BWP is supposed to be associated with a particular numerology (subcarrier spacing, cyclic prefix length, etc.). The UE receives in the active DL BWP using the numerology associated with the DL BWP and transmits in the active UL BWP using the numerology associated with the UL BWP.

The BWP configuration includes numerology, frequency position (eg, center frequency), bandwidth (eg, number of resource blocks (also called RB (Resource Block), PRB (Physical RB), etc.)), time resources ( For example, information such as a slot (mini slot) index, a cycle) may be included.

The BWP setting may be notified by, for example, higher layer signaling. Here, the upper layer signaling may be, for example, any one of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

For MAC signaling, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like may be used. The broadcast information may be, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), a minimum system information (RMSI: Remaining Minimum System Information), or the like.

At least one of the set DL BWPs (for example, the DL BWP included in the primary CC) may include a control resource set (CORESET: COntrol REsource SET) of the common search space.

CORESET is an allocation candidate area of a control channel (for example, PDCCH (Physical Downlink Control Channel)), and is a control subband, a search space set, a search space resource set, a control area, a control subband, and an NR-PDCCH. It may be called an area or the like.

Further, each of the set DL BWPs may include a CORESET of a UE-specific search space.

The control channel transmits a physical layer control signal (for example, downlink control information (DCI)) to a base station (for example, BS (Base Station), transmission / reception point (TRP: Transmission / Reception Point), eNB (eNodeB)). , GNB (may be called NR NodeB), etc.) to transmit to the UE.

DCI can be, for example, scheduled data resources (time and / or frequency resources), transport blocks (eg, Transport Block Size (TBS)), modulation and / or coding schemes, delivery confirmation information (eg, Transport Block Size). For example, it may be scheduling information including information on at least one such as retransmission control information (also referred to as HARQ-ACK, ACK / NACK, etc.), data demodulation reference signal (DMRS), and the like.

A DCI that schedules DL data (eg, Physical Downlink Shared Channel (PDSCH)) reception and / or measurement of a DL reference signal may be referred to as DL Assignment, DL Grant, DL DCI, and the like. The DCI that schedules the transmission of UL data (eg, Physical Uplink Shared Channel (PUSCH)) and / or the transmission of UL sounding (measurement) signals may be referred to as UL Grant, UL DCI, and the like.

The UE may receive the CORESET setting information (which may be referred to as CORESET setting) from the radio base station. The UE can detect the physical layer control signal by monitoring the CORESET set in the own terminal.

The CORESET setting may be notified by, for example, higher layer signaling (eg, RRC signaling, SIB, etc.).

The CORESET settings include the CORESET frequency resource (eg, RB number), time resource (eg, start OFDM symbol number), duration, REG (Resource Element Group) bundle size (REG size), transmission type (eg, eg). It may include CORESET-related parameters (such as CORESET parameters, PDCCH monitor parameters, etc.) such as interleaved, non-interleaved), period (eg, monitor period for each CORESET).

Further, search space-related parameters (which may be referred to as search space settings, search space parameters, etc.) may be set for the UE. Search space parameters may be notified, for example, by higher layer signaling (eg, RRC signaling). Search space parameters may be included in the CORESET setting. Further, the CORESET setting may be referred to as a search space setting.

The search space parameters are parameters for specifying the hash function used for deriving the search space, parameters used for the hash function, and parameters for cyclic redundancy check (CRC) masking (for example, UE identifier (for example, UE identifier). It may include a UE-ID (Identifier), a wireless network temporary identifier (RNTI: Radio Network Temporary Identifier), a virtual UE-ID, and the like).

As described above, it is considered that the NR is controlled based on CORESET, BWP and the like. However, studies have not yet been made on how to specifically set these in the UE and how the UE operates. If an appropriate setting method and UE operation are not used, the amount of communication may increase unnecessarily, resulting in deterioration of communication throughput, frequency utilization efficiency, and the like.

Therefore, the present inventors have conceived a setting method when performing control based on BWP.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The wireless communication methods according to each embodiment may be applied individually or in combination.

In addition, "BWP" in the description of this specification may be read as "at least one of DL BWP and UL BWP". Further, the "monitor of CORESET" in the description of the present specification may be read as "a monitor of a search space (downlink control channel candidate) or a downlink control channel (for example, PDCCH) associated with CORESET".

(Wireless communication method)
<First Embodiment>
The first embodiment relates to associating a BWP setting with a CORESET setting. The first embodiment can be roughly divided into two. One is an embodiment (Embodiment 1.1) in which the BWP setting includes one or more CORESET settings. The other is an embodiment (Embodiment 1.2) in which the BWP setting is associated with one or more CORESET settings.

1A and 1B are diagrams showing an example of the relationship between the BWP setting and the CORESET setting according to the first embodiment. FIG. 1A corresponds to embodiment 1.1. In the example of FIG. 1A, BWP setting 1 (eg, DL BWP setting) includes two CORESET settings (CORESET settings 1 and 2).

Each BWP setting notified by higher layer signaling may be configured to include one or more CORESET settings, respectively.

FIG. 1B corresponds to embodiment 1.2. In the example of FIG. 1B, the BWP setting 1 (eg, DL BWP setting) does not include the CORESET setting. On the other hand, the CORESET setting includes information indicating (identifying) the relevant BWP setting. In this example, each of the CORESET settings 1 and 2 contains information indicating that the associated BWP setting is '1' (BWP setting 1).

Thus, multiple CORESET settings may be associated with the same BWP setting or may be associated with different BWP settings. Each CORESET setting notified by higher layer signaling may be configured to contain information for identifying one or more related BWP settings, respectively. For example, when CORESET setting 1 is used in BWP setting 1 and BWP setting 2, CORESET setting 1 may include information indicating BWP setting 1 and 2 as information indicating related BWP setting.

The information indicating the relevant BWP settings may include, for example, the index of the BWP, or may include information indicating at least one of the frequency resources corresponding to the BWP (eg, center frequency, bandwidth, PRB index, etc.).

As a modification of Embodiment 1.1, the BWP setting may not directly include the CORESET setting, but may include information indicating (specifying) the related CORESET setting. Further, as a modification of the first embodiment 1.2, the configuration may include the BWP setting directly instead of including the information indicating the BWP setting related to the CORESET setting.

Further, a configuration may be adopted in which one or more BWP settings include a CORESET setting, while one or more CORESET settings include a BWP setting. In this case, the association based on either the BWP setting or the CORESET setting may be prioritized, or both associations may be used.

According to the first embodiment described above, the UE can appropriately grasp the correspondence between BWP and CORESET and can suitably perform transmission / reception according to the scheduling of the base station.

<Second embodiment>
The second embodiment relates to BWP switching. Here, BWP switching refers to switching of active BWP, and the name is not limited to this. BWP switching may be directed by a predetermined signaling (eg, any or a combination of RRC signaling, MAC signaling, DCI, etc.) or may be based on a predetermined timer.

For example, the UE may switch the active BWP when a plurality of BWPs are set in advance and a DCI indicating BWP switching (for example, DL assignment, UL grant, etc.) is received. Such control may be referred to as scheduling DCI-based active BWP switching.

Note that BWP switching may be instructed by a DCI that schedules resources of size 0 (in this case, the UE does not have to send and receive at the same time as BWP switching).

The UE may switch the active BWP when the timer for BWP switching expires. For example, the UE may deactivate the active BWP and activate a given BWP (eg, the default BWP) when the timer expires. Such control may be referred to as timer-based active BWP switching.

The default BWP may be predetermined by the specifications (for example, it may be assumed to be the BWP used first or set first), or may be set by higher layer signaling or the like. Further, the information regarding the timer (time until expiration, timer start condition, etc.) may be set by higher layer signaling or the like.

The transition period of BWP switching (which may also be referred to as the BWP switching period) is such that the UE responds to the new BWP COREST from, for example, the start of transmission or reception of DCI indicating BWP switching, or the expiration of the timer for BWP switching. It may be defined as the time difference before starting the monitoring of the attached search space or PDCCH.

In the BWP switching period, there is an ambiguity period in which BWP is active. For this reason, the BWP switching period may be referred to as the ambiguous period. The BWP switching period may be, for example, 1 ms, or may be a period corresponding to a predetermined number of symbols (14 symbols, 28 symbols, etc.). The BWP switching period may be determined based on the UE Capability for RF retuning.

In the second embodiment, the UE determines the CORESET including the PDCCH candidate to be monitored when BWP switching occurs. By clarifying the method of determining the CORESET to be monitored during the BWP switching period, it is possible to suppress the performance deterioration related to the BWP switching.

The method of associating the BWP (BWP setting) with the CORESET (CORESET setting) in the second embodiment may be the method described above in the first embodiment.

In one aspect of the second embodiment, the UE monitors the CORESET for the active BWP (active DL BWP) (Embodiment 2.1). If the base station wants the UE to monitor both the CORESET for the active BWP before BWP switching and the CORESET for the new active BWP after BWP switching, the base station is set to associate the new active BWP with both of these CORESETs. You just have to do.

The UE in embodiment 2.1 may assume that only the new BWP after BWP switching is active during the ambiguous period. In addition, in this specification, "assuming" may be read as "deemed".

In another aspect of the second embodiment, the UE monitors the CORESET for the active BWP (active DL BWP). The UE also monitors both the CORESET for the active BWP before the BWP switching and the CORESET for the new active BWP after the BWP switching during the BWP switching period (Embodiment 2.2). Compared with the case of the second embodiment, the amount of information for associating the BWP with the CORESET can be reduced.

In yet another aspect of the second embodiment, the UE monitors the CORESET for the active BWP (active DL BWP). Also, in the BWP switching period, one of the active BWP before BWP switching and the new active BWP after BWP switching is a subset (eg, includes) of the other or a superset of the other (eg,). In the case of inclusion), the CORESET for both BWPs is monitored (Embodiment 2.3). In the case of the second embodiment, since the frequency retuning may not be necessary for the CORESET monitor, the failure of the PDCCH monitor can be suppressed.

It should be noted that Embodiments 2.2 and / or 2.3 may be applied when the active BWP before and after BWP switching corresponds to the same numerology, or may be applied when they correspond to different numerologies. May be good.

For example, in the case of applying the same numerology, it is not necessary to apply multiple Fast Fourier Transforms (IFFTs) having different sampling rates at the same time, so that the UE has an excessive increase in processing load. You can monitor multiple CORESETs without any.

Further, in the case of applying to different numerologies, the candidate band of BWP can be widened, for example, switching between BWP of low frequency band and BWP of high frequency band. Further, it is possible to switch between high-speed communication for eMBB (enhanced Mobile Broad Band) and highly reliable communication of URLLC (Ultra Reliable and Low Latency Communications) as needed.

FIG. 2 is a diagram showing an example of a monitor target at the time of BWP switching according to the second embodiment. In this example, the transition from top to bottom in the figure indicates switching from BWP1 to BWP2 (deactivation of BWP1 & activation of BWP2), and the reverse transition is switching from BWP2 to BWP1 (deactivation of BWP2). & BWP1 activation) is shown.

The center of FIG. 2 corresponds to the ambiguous period. With either switching, the UE can monitor the CORESET of each BWP during an ambiguous period, for example, based on methods such as embodiments 2.2 and 2.3.

FIG. 3 is a diagram showing another example of the monitor target at the time of BWP switching according to the second embodiment. In this example, the transition from top to bottom in the figure indicates switching from BWP1 to BWP2 (deactivation of BWP1 & activation of BWP2), and the reverse transition is switching from BWP2 to BWP1 (deactivation of BWP2). & BWP1 activation) is shown.

The center of FIG. 3 corresponds to the ambiguous period. BWP1 corresponds to New Melology 1 and BWP2 corresponds to New Melology 2. With either switching, the UE can monitor the CORESET of each BWP during an ambiguous period, for example based on methods such as embodiment 2.2.

When the UE monitors a plurality of CORESETs related to a plurality of BWPs during an ambiguous period, the UE may assume that all of the plurality of BWPs are active. There may be multiple active BWPs during the ambiguous period.

The UE may treat a predetermined partial band including the plurality of BWPs as one BWP. Here, a BWP including a plurality of BWPs and treated as one BWP may be referred to as an extended BWP, a switching period BWP, or the like. The UE may assume that the active BWP is the extended BWP during the switching period.

Also, if the UE monitors a plurality of CORESETs for a plurality of BWPs during an ambiguous period, the UE may assume that at least one of the plurality of BWPs is deactive. However, the UE may monitor the CORESET in the BWP that is assumed to be such a deactive. Such a deactive and CORESET monitoring state may be referred to as a semi-active state, a semi-activated state, a monitoring state, or the like.

In a normal deactive BWP, for example, the UE does not monitor the PDCCH, does not transmit the PUCCH, and so on, and the UE performs less operations than the operations in the active BWP.

According to the second embodiment described above, the UE can appropriately determine the CORESET to be monitored even during the ambiguous period associated with BWP switching.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.

FIG. 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of fundamental frequency blocks (component carriers) with the system bandwidth (for example, 20 MHz) of the LTE system as one unit is applied. can do.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these may be called.

The radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. , Is equipped. Further, a user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time by using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

Communication can be performed between the user terminal 20 and the radio base station 11 using a carrier (also referred to as an existing carrier or a legacy carrier) having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth. On the other hand, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the wireless base station 12, or the wireless base station 11 and the wireless base station 11. The same carrier as between may be used. The configuration of the frequency band used by each radio base station is not limited to this.

Further, the user terminal 20 can perform communication in each cell using Time Division Duplex (TDD) and / or Frequency Division Duplex (FDD). Further, in each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

The numerology may be a communication parameter applied to the transmission and / or reception of a signal and / or channel, eg, subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, specific filtering process performed by the transmitter / receiver in the frequency domain, specific windowing process performed by the transmitter / receiver in the time domain, and the like. For example, if the subcarrier spacing of the constituent OFDM symbols is different and / or the number of OFDM symbols is different for a certain physical channel, it may be said that the numerology is different.

The radio base station 11 and the radio base station 12 (or between the two radio base stations 12) are connected by wire (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or by radio. May be done.

The radio base station 11 and each radio base station 12 are each connected to the host station device 30, and are connected to the core network 40 via the host station device 30. The host station device 30 includes, but is not limited to, an access gateway device, a wireless network controller (RNC), a mobility management entity (MME), and the like. Further, each radio base station 12 may be connected to the host station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. Further, the radio base station 12 is a radio base station having local coverage, and is a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point or the like. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as the radio base station 10.

Each user terminal 20 is a terminal corresponding to various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the wireless communication system 1, orthogonal frequency division multiple access (OFDMA) is applied to the downlink as a wireless access method, and single carrier-frequency division multiple access (SC-FDMA) is applied to the uplink. Frequency Division Multiple Access) and / or OFDMA applies.

OFDMA is a multi-carrier transmission system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), data is mapped to each subcarrier, and communication is performed. SC-FDMA is a single carrier transmission that reduces interference between terminals by dividing the system bandwidth into a band composed of one or a continuous resource block for each terminal and using different bands for a plurality of terminals. It is a method. The uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

In the wireless communication system 1, as downlink channels, downlink shared channels (PDSCH: Physical Downlink Shared Channel), broadcast channels (PBCH: Physical Broadcast Channel), downlink L1 / L2 control channels, etc. shared by each user terminal 20 are used. Used. User data, upper layer control information, SIB (System Information Block), etc. are transmitted by the PDSCH. In addition, MIB (Master Information Block) is transmitted by PBCH.

The downlink L1 / L2 control channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) and the like. Downlink control information (DCI) including scheduling information of PDSCH and / or PUSCH is transmitted by PDCCH.

Scheduling information may be notified by DCI. For example, a DCI that schedules DL data reception may be referred to as a DL assignment, and a DCI that schedules UL data transmission may be referred to as a UL grant.

The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to PUSCH. The EPDCCH is frequency-division-multiplexed with the PDSCH (downlink shared data channel), and is used for transmission of DCI and the like like the PDCCH.

In the wireless communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH:) shared by each user terminal 20 are used. Physical Random Access Channel) etc. are used. User data, upper layer control information, and the like are transmitted by PUSCH. In addition, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), and the like. The PRACH transmits a random access preamble to establish a connection with the cell.

In the wireless communication system 1, the downlink reference signal includes a cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS), and a demodulation reference signal (DMRS:). DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. Further, in the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be called a user terminal specific reference signal (UE-specific reference signal). Further, the reference signal to be transmitted is not limited to these.

(Wireless base station)
FIG. 5 is a diagram showing an example of the overall configuration of the radio base station according to the embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may be configured to include one or more of each.

The user data transmitted from the radio base station 10 to the user terminal 20 by the downlink is input from the host station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

The baseband signal processing unit 104 processes user data in a PDCP (Packet Data Convergence Protocol) layer, divides / combines user data, performs RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access). Control) Transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. is performed in the transmission / reception unit. Transferred to 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 into a radio frequency band and transmits the signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmission / reception unit 103 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on the common recognition in the technical field according to the present disclosure. The transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing, and error correction for the user data included in the input uplink signal. Decryption, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed, and the data is transferred to the host station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of the communication channel, status management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the host station apparatus 30 via a predetermined interface. Further, the transmission line interface 106 transmits / receives a signal (backhaul signaling) to / from another radio base station 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). You may.

The transmission / reception unit 103 may transmit downlink control information (for example, DCI) in a control resource set (CORESET: COntrol REsource SET) related to an active bandwidth portion (BWP: BandWidth Part).

The transmission / reception unit 103 may transmit information regarding BWP settings, CORESET settings, BWP switching, and the like to the user terminal 20.

FIG. 6 is a diagram showing an example of the functional configuration of the radio base station according to the embodiment of the present disclosure. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. It should be noted that these configurations may be included in the radio base station 10, and some or all of the configurations may not be included in the baseband signal processing unit 104.

The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal allocation in the mapping unit 303, and the like. Further, the control unit 301 controls signal reception processing by the reception signal processing unit 304, signal measurement by the measurement unit 305, and the like.

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resources). Allocation) is controlled. Further, the control unit 301 controls the generation of the downlink control signal, the downlink data signal, and the like based on the result of determining the necessity of the retransmission control for the uplink data signal.

The control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals (for example, CRS, CSI-RS, DMRS).

The control unit 301 uses an uplink data signal (for example, a signal transmitted by PUSCH), an uplink control signal (for example, a signal transmitted by PUCCH and / or PUSCH, delivery confirmation information, etc.), and a random access preamble (for example, PRACH). Controls scheduling of transmitted signals), uplink reference signals, etc.

The control unit 301 may schedule the active BWP of the user terminal 20. The control unit 301 may control the transmission of DCI in the CORESET associated with the active BWP.

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303. The transmission signal generation unit 302 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying the downlink data allocation information and / or a UL grant for notifying the uplink data allocation information based on an instruction from the control unit 301. Both DL assignments and UL grants are DCI and follow the DCI format. Further, the downlink data signal is coded and modulated according to a coding rate, a modulation method, and the like determined based on channel state information (CSI) from each user terminal 20 and the like.

Based on the instruction from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource and outputs it to the transmission / reception unit 103. The mapping unit 303 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, HARQ-ACK is output to the control unit 301. Further, the reception signal processing unit 304 outputs the reception signal and / or the signal after the reception processing to the measurement unit 305.

The measuring unit 305 performs measurement on the received signal. The measuring unit 305 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measuring unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, or the like based on the received signal. The measuring unit 305 has received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). , Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

(User terminal)
FIG. 7 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. The transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may be configured to include one or more of each.

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmission / reception unit 203 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on the common recognition in the technical field according to the present disclosure. The transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction / decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Further, among the downlink data, the broadcast information may also be transferred to the application unit 205.

On the other hand, the uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Transferred to 203.

The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

The transmission / reception unit 203 may monitor a control resource set (CORESET: COntrol REsource SET) related to an active bandwidth portion (BWP: BandWidth Part).

The transmission / reception unit 203 may receive information regarding the BWP setting, the CORESET setting, the BWP switching, and the like from the radio base station 10. The information regarding BWP switching may include information indicating BWP switching (for example, DCI), or may include information regarding a timer for BWP switching.

FIG. 8 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. It should be noted that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. Further, the control unit 401 controls the signal reception processing in the reception signal processing unit 404, the signal measurement in the measurement unit 405, and the like.

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.

The control unit 401 may determine the association between the BWP setting and the CORESET setting. The control unit 401 may determine the CORESET to be monitored when the BWP is active, based on the information of the BWP setting and / or the CORESET setting.

Even if the control unit 401 determines the CORESET to be monitored during the period (switching period) between switching the active BWP from the first BWP (active BWP before switching) to the second BWP (active BWP after switching). Good.

For example, the control unit 401 may use the first BWP in the above period when the first BWP is associated with the first CORESET and the second BWP is associated with the first CORESET and the second CORESET. And control to monitor both the second CORESET may be performed.

In other words, if the CORESET to be monitored after switching includes the CORESET to be monitored before switching (or regardless of the CORESET to be monitored before switching), the control unit 401 may monitor the target after switching during the switching period. You may control to monitor each CORESET of.

When the first BWP is associated with the first CORESET and the second CORESET, and the second BWP is associated with the second CORESET, the control unit 401 performs the first CORESET and the first CORESET in the above period. Control may be performed to monitor both of 2 CORESETs.

In other words, the control unit 401 may control to monitor each CORESET of the monitor target before switching during the switching period regardless of the CORESET of the monitor target after switching.

When the first BWP is associated with the first CORESET and the second BWP is associated with the second CORESET, the control unit 401 can perform both the first CORESET and the second CORESET in the above period. You may control to monitor.

In other words, the control unit 401 may control to monitor each CORESET to be monitored before and after the switching during the switching period even if the CORESET after switching does not include the CORESET before switching.

When one of the first BWP and the second BWP includes the other, the control unit 401 uses the first CORESET associated with the first BWP and the second BWP associated with the second BWP during the above period. You may control to monitor both of the CORESET.

In other words, when either the BWP before or after switching is a subset of the other BWP, the control unit 401 may control to monitor each CORESET to be monitored before and after switching during the switching period.

Further, when various information notified from the radio base station 10 is acquired from the received signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401, and outputs the uplink signal to the mapping unit 403. The transmission signal generation unit 402 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on the common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 402 generates an uplink control signal regarding delivery confirmation information, channel state information (CSI), and the like, for example, based on an instruction from the control unit 401. Further, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the radio base station 10 includes a UL grant.

Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to the radio resource and outputs it to the transmission / reception unit 203. The mapping unit 403 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10. The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. Further, the received signal processing unit 404 can form a receiving unit according to the present disclosure.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. Further, the reception signal processing unit 404 outputs the reception signal and / or the signal after the reception processing to the measurement unit 405.

The measuring unit 405 performs measurement on the received signal. The measuring unit 405 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measuring unit 405 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 405 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically and / or logically coupled device, or two or more physically and / or logically separated devices directly and / /. Alternatively, it may be indirectly connected (eg, by wire and / or wirelessly) and realized by using these plurality of devices.

For example, the wireless base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 9 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the embodiment. The radio base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the word "device" can be read as a circuit, device, unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by one or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the radio base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an calculation and the communication device 1004 is used. It is realized by controlling communication and controlling reading and / or writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the baseband signal processing unit 104 (204), the call processing unit 105, and the like described above may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

The memory 1002 is a computer-readable recording medium, for example, at least one of a suitable storage medium such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically EPROM), RAM (Random Access Memory), and the like. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment.

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (CD-ROM)), a digital versatile disk, or the like. At least one of Blu-ray® disks, removable disks, hard disk drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured. For example, the above-mentioned transmission / reception antenna 101 (201), amplifier unit 102 (202), transmission / reception unit 103 (203), transmission line interface 106, and the like may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
In addition, the terms described in the present specification and / or the terms necessary for understanding the present specification may be replaced with terms having the same or similar meanings. For example, the channel and / or symbol may be a signal (signaling). Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC: Component Carrier) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

Further, the radio frame may be composed of one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) independent of numerology.

Further, the slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). Further, the slot may be a time unit based on numerology. Further, the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot.

Radio frames, subframes, slots, mini-slots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. For example, one subframe may be called a Transmission Time Interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. You may. That is, the subframe and / or TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-encoded data packet (transport block), a code block, and / or a code word, or may be a processing unit such as scheduling and link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, the code block, and / or the code word is actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, or the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, or subslots.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The RB may also include one or more symbols in the time domain and may be one slot, one mini slot, one subframe or one TTI in length. One TTI and one subframe may each be composed of one or more resource blocks. In addition, one or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

The above-mentioned structures such as a wireless frame, a subframe, a slot, a minislot, and a symbol are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

In addition, the information, parameters, etc. described in the present specification may be expressed using absolute values, relative values from predetermined values, or other corresponding information. May be represented as. For example, radio resources may be indicated by a given index.

The names used for parameters and the like in the present specification are not limited in any respect. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, and therefore various assigned to these various channels and information elements. The name is not limited in any way.

The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Further, information, signals and the like can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals, etc. may be input / output via a plurality of network nodes.

The input / output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

The notification of information is not limited to the embodiments / embodiments described herein, and may be given by other methods. For example, information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, etc.). It may be carried out by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling, other signals, or a combination thereof.

The physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRCConnectionSetup message, an RRCConnectionReconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.

Further, software, instructions, information and the like may be transmitted and received via a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twist pair, Digital Subscriber Line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) to create a website, server. , Or when transmitted from other remote sources, these wired and / or wireless technologies are included within the definition of transmission medium.

The terms "system" and "network" as used herein are used interchangeably.

In this specification, "Base Station (BS)", "Wireless Base Station", "eNB", "gNB", "Cell", "Sector", "Cell Group", "Carrier" and "Component" The term "carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

A base station can accommodate one or more (eg, three) cells (also referred to as sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage.

In the present specification, the terms "mobile station (MS)", "user terminal", "user equipment (UE)" and "terminal" may be used interchangeably. ..

Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client or some other suitable term.

Further, the radio base station in the present specification may be read by the user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have the function of the radio base station 10 described above. In addition, words such as "up" and "down" may be read as "side". For example, the upstream channel may be read as a side channel.

Similarly, the user terminal in the present specification may be read as a radio base station. In this case, the wireless base station 10 may have the functions of the user terminal 20 described above.

In the present specification, the operation performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by one or more network nodes other than the base station and the base station (for example, the base station). It is clear that MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these) or a combination thereof can be used.

Each aspect / embodiment described in the present specification may be used alone, in combination, or may be switched and used according to the execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present specification may be changed as long as there is no contradiction. For example, the methods described herein present elements of various steps in an exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademarks) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), LTE 802 It may be applied to systems utilizing .20, UWB (Ultra-WideBand), Bluetooth®, and other suitable wireless communication methods and / or next-generation systems extended based on them.

The phrase "based on" as used herein does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

No reference to elements using designations such as "first", "second", etc. as used herein generally limits the quantity or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

As used herein, the term "determining" may include a wide variety of actions. For example, "judgment" means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another data). It may be regarded as "judgment (decision)" such as (search in structure) and confirmation (ascertaining). In addition, "judgment (decision)" means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as "judgment (decision)" of "accessing" (for example, accessing data in memory). In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, choosing, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection between two or more elements or It means a bond and can include the presence of one or more intermediate elements between two elements that are "connected" or "bonded" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access."

As used herein, when two elements are connected, one or more wires, cables and / or printed electrical connections are used, and as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energies having wavelengths in the microwave and / or light (both visible and invisible) regions.

As used herein, the term "A and B are different" may mean "A and B are different from each other." Terms such as "leave" and "combined" may be interpreted similarly.

As used herein or in the claims, "including," "comprising," and variations thereof, these terms are as comprehensive as the term "comprising." Intended to be targeted. Moreover, the term "or" as used herein or in the claims is intended not to be an exclusive OR.

Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present specification. The invention according to the present disclosure can be implemented as a modified or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description herein is for purposes of illustration and does not provide any restrictive meaning to the invention according to the present disclosure.

Claims (5)

A receiver that monitors the control resource set (CORESET: COntrol REsource SET) associated with the active bandwidth part (BWP).
A user terminal comprising: a control unit that determines CORESET to be monitored during the period between switching the active BWP from the first BWP to the second BWP. When the first BWP is associated with the first CORESET and the second BWP is associated with the first CORESET and the second CORESET, the control unit performs the first CORESET in the period. The user terminal according to claim 1, wherein the control for monitoring both the second CORESET and the second CORESET is performed. When the first BWP is associated with the first CORESET and the second BWP is associated with the second CORESET, the control unit performs the first CORESET and the second CORESET during the period. The user terminal according to claim 1, wherein the control for monitoring both of the above is performed. The control unit is associated with the first CORESET and the second BWP associated with the first BWP during the period when one of the first BWP and the second BWP includes the other. The user terminal according to claim 1, wherein control is performed to monitor both of the second CORESETs. Steps to monitor the COSETET associated with the active bandwidth part (BWP), and
A wireless communication method comprising: determining CORESET to be monitored during the period between switching the active BWP from the first BWP to the second BWP.

Images